Create customer

POST/api/v1/customers

Create a new customer record for the business.

Operation ID: create_customer·View as markdown·OpenAPI slice

Authentication

Bearer token authentication. Pass your DayZero API token in the Authorization header and the target business UUID in x-business-id.

Request body

Schema: CustomerCreateRequest

namestringrequired: Customer name (person or company).
emailstring · emailrequired: Customer email for invoices and communications.
addressstring: Customer billing/shipping address.
phonestring: Customer phone number.
tax_idstring: Tax identification number (EIN, VAT, etc.).
websitestring: Customer website URL.
notesstring: Internal notes about this customer.
credit_limit_centsinteger: Credit limit in cents (e.g., 100000 = $1,000.00).
default_payment_term_idstring: Default payment term ID for new invoices.
statusCounterpartyStatusCounterpartyStatus: Customer status (active, inactive, blocked).
categorystring: Business category (e.g., 'Retail', 'Wholesale').
invoice_footerstring: Custom invoice footer/payment instructions for this customer. Overrides business default.

Responses

201Successful Response

Schema: SuccessEnvelope_CustomerResponse_

successboolean
messagestring
codestring
dataCustomerResponse

400Bad Request - Invalid input

Schema: ErrorResponse

errorstringrequired: Error category: validation_error, unauthorized, forbidden, not_found, conflict, rate_limited, server_error, or service_unavailable.
messagestringrequired: Human-readable explanation, safe to show to end users.
codestringrequired: Stable machine-readable code in CATEGORY_NNN form (e.g. NOT_FOUND_006, AUTH_010, GEN_002).
request_idstring: Correlation id for support requests. Echoes the x-request-id request header when one was supplied.
errorsobject: Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

401Unauthorized - Missing or expired token, an MCP OAuth token used against the REST API, or no access to this business

Schema: ErrorResponse

errorstringrequired: Error category: validation_error, unauthorized, forbidden, not_found, conflict, rate_limited, server_error, or service_unavailable.
messagestringrequired: Human-readable explanation, safe to show to end users.
codestringrequired: Stable machine-readable code in CATEGORY_NNN form (e.g. NOT_FOUND_006, AUTH_010, GEN_002).
request_idstring: Correlation id for support requests. Echoes the x-request-id request header when one was supplied.
errorsobject: Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

403Forbidden - Insufficient permissions

Schema: ErrorResponse

errorstringrequired: Error category: validation_error, unauthorized, forbidden, not_found, conflict, rate_limited, server_error, or service_unavailable.
messagestringrequired: Human-readable explanation, safe to show to end users.
codestringrequired: Stable machine-readable code in CATEGORY_NNN form (e.g. NOT_FOUND_006, AUTH_010, GEN_002).
request_idstring: Correlation id for support requests. Echoes the x-request-id request header when one was supplied.
errorsobject: Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

422Validation Error

Schema: ErrorResponse

errorstringrequired: Error category: validation_error, unauthorized, forbidden, not_found, conflict, rate_limited, server_error, or service_unavailable.
messagestringrequired: Human-readable explanation, safe to show to end users.
codestringrequired: Stable machine-readable code in CATEGORY_NNN form (e.g. NOT_FOUND_006, AUTH_010, GEN_002).
request_idstring: Correlation id for support requests. Echoes the x-request-id request header when one was supplied.
errorsobject: Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

Code samples

POST/api/v1/customers

bash

curl -X POST 'https://api.ondayzero.com/api/v1/customers' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID' \
  -H 'Content-Type: application/json' \
  -d '{
  "address": "123 Main Street, Suite 100, San Francisco, CA 94102",
  "category": "Wholesale",
  "credit_limit_cents": 1000000,
  "email": "billing@acme.com",
  "name": "Acme Corporation",
  "notes": "Preferred customer, always pays on time",
  "phone": "(555) 123-4567",
  "status": "active",
  "tax_id": "12-3456789",
  "website": "https://acme.com"
}'